The holidays are about a lot of things: Peace, togetherness, sharing, giving, and, of course, drinking. Between holiday parties and New Year’s Eve blow-outs (and maybe even a couple extra fingers of whiskey to help ease family tensions), plenty of alcohol will go down the hatch over the next couple of weeks. But before we reach for that candy cane cocktail, we talk with Adam Rogers, who’s been studying the science, history and sociology of alcohol for his book, Proof: The Science of Booze.